CN100495858C - Method for sampling and processing transmission data for protecting transmission line optical-fiber longitudinal difference - Google Patents
Method for sampling and processing transmission data for protecting transmission line optical-fiber longitudinal difference Download PDFInfo
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- CN100495858C CN100495858C CNB2007100224356A CN200710022435A CN100495858C CN 100495858 C CN100495858 C CN 100495858C CN B2007100224356 A CNB2007100224356 A CN B2007100224356A CN 200710022435 A CN200710022435 A CN 200710022435A CN 100495858 C CN100495858 C CN 100495858C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The method comprises: processing fiber differential signals from master machine and slave machine side; the slave machine sends out the message format, and the transmitted data is the unprocessed real time sampling point data, the bus voltage of slave machine side and the bus negative sequence voltage; the master machine sends the failure information of slave machine differential protection, and the slave machine side simultaneously reports the protection signals used for realizing the voltage-locking at both side of differential protection; Ia,Ib,Ic are the data of three phase current sampling point of slave machine side; the master machine receives the sampling data of three phase current sent from the slave machine, and compares the data with its own three phase current in order to calculate the differential current; the differential protection uses the split-phase type ratio differential protection, and based on the feature of line failure, uses the both side voltage locking differential protection.
Description
Technical field
The present invention relates to based on nanosecond precision synchronized sampling control and high-rate data transmission techniques, be used to realize transmission line optical-fiber longitudinal difference protection transmission sampled point initial data and the sampling original data processing.Especially utilize synchronized sampling control and data transmission technology to realize optical-fiber longitudinal difference protection based on coding and decoding.
Background technology
The transfer of data and the processing method of present existing circuit optical fiber longitudinal differential protection are described below:
Provide good solution based on the current differential protection of optical fiber communication for the relaying protection of circuit.Its key technology is to solve circuit two ends communication issue, and promptly synchronized sampling how obtains reliably to side data, how to adjust or the like after losing synchronously.Present existing circuit optical fiber longitudinal differential protection simultaneous techniques is generally adjusted method or the same footwork of GPS based on sampling instant.Sampling instant is adjusted method synchronized sampling precision and is controlled at Millisecond, and GPS is controlled at delicate level with footwork synchronized sampling precision.Be subjected to the restriction of synchronized sampling precision and message transmission rate, the electric current transmitted data are the recombination current of three-phase current or the current vector r+lj that calculates through Fu Shi.Data processing only limits to realize longitudinal difference protection and simple data monitoring.
The transfer of data of existing circuit optical fiber longitudinal differential protection and the weak point of processing method:
1. because the synchronized sampling precision is low, can only transmit the recombination current of three-phase current or the current vector r+lj that calculates through Fu Shi.Having little significance of transmission real-time sampling initial data.
2. host computer side can not monitor from the phase place of pusher side electric current, and debugging is made troubles for putting into operation.
3. during fault, both sides device record wave energy can only be enrolled sample rate current separately, brings difficulty for accident analysis.
4. the error code that causes for passage can only monitor, and throws away current transmission current data, can't error correction, and protection sensitivity is reduced.
Summary of the invention
The objective of the invention is: propose a kind ofly, realize circuit optical fiber longitudinal differential protection transmission sampling initial data and the method for sampling original data processing based on nanosecond synchronization controlling of sampling and high-rate data transmission techniques.
Technical solution of the present invention is: transmission data with transmission line optical-fiber longitudinal difference protection sampling and the method for handling,
Slave sends message format, and the data of transmission are without the real-time sampling point data of computing and slave side bus voltage and bus negative sequence voltage; Main frame sends slave longitudinal difference protection fault message, reports guard signal simultaneously from pusher side: comprise synchronous regime: this machine synchronous regime; Uab, Ubc, U2: slave side bus voltage magnitude and bus negative sequence voltage amplitude are used to realize longitudinal difference protection both sides voltage blocking; Ia, Ib, Ic: from pusher side three-phase current sampling number certificate; The sampled data of the three-phase current that main frame reception slave sends and the three-phase current of this machine relatively calculate three and differ stream; Longitudinal difference protection adopts the split-phase type percentage differential, and according to the characteristics of line fault, adopts both sides voltage blocking differential protection.
Main frame of the present invention sends message format: same trip command divides former trip command and negate trip command to send in same frame, sends fault message simultaneously.
The slave sampled data that main frame adopts error correction to receive is handled sampling of this machine and slave and is sent data.
Realize phase place, the amplitude of the current/voltage and the three-phase current that slave transmits of main frame computation host, and show in real time.It is characterized in that calculating the amplitude phase place of slave three-phase current, and show its amplitude and phase place.
Admission is from the three-phase current of pusher side when realizing fault.During the record ripple, main frame can be enrolled the three-phase current of slave.
Realize that main frame monitors when only once error code produces in two cycles, adopt the mean value algorithm, wrong code data is carried out error correction.When it is characterized in that only once error code produces in two cycles, adopt the mean value algorithm, wrong code data is carried out error correction.
Quick identification fault optical-fibre channel: according to the synchronous regime of principal and subordinate's machine, quick identification fault optical-fibre channel.Work of the present invention is based on such principle: for the system of primary and secondary structure, the host computer side timing sampling is controlled by host computer side and returns sampled data from pusher side; The channel coding method of data sampling and transfer of data adopts synchronously and the data double-way transmission, and the channel encoder log-on data transmission pulse by main frame is provided with the output synchronizing signal in the pulse of channel encoder transfer of data; Slave uses this signal enabling data sampling and transfer of data; Promptly start the slave sampling at moment Ts, in all the other periods transmission data;
The output synchronizing signal is continuous two width t
h(as=3/4T) signal that begins of expression frame synchronization, and in territory subsequently, transmit application layer data.Wherein continuous two width t
h(as=3/4T) represent the signal that frame synchronization begins, width is t
0Logical zero is represented in the pulse of (=1/4T), and wherein width is t
1Logical one is represented in the pulse of (=1/4T); t
h--synchronizing signal t
f--synchronization frame width t
0--logical zero coding t
1--logical one coding, T--symbol width T
s--synchronization point; Slave is being received code signal, therefrom recovers synchronizing signal DSYN and command information, and in the rising edge startup ADC of DSYN sampling, the back starts encoder transmission last a sampled data constantly simultaneously.
Construct interrupt control unit by FPGA or CPLD, the interrupt source of controller comprises that decoder interrupts and ADC interrupts, and can shield respectively.After wherein ADC interrupts occurring in ADC EOC and data and has been read into the ADC controller.Decoder interrupts occurring in the dual port RAM that decoder deposits the previous frame data in decoder and receives after the new synchronizing signal.By FPGA or CPLD control A/D sampling, and the synchronized sampling control signal is exported by channel decoder, and sampled signal is delivered to the offside decoder after by channel encoder appended synchronization control signal, realizes that synchronizing signal recovers and data decode.
LOCK is that decoder receives efficient coding data and locking.
Main frame uses synchronizing signal to start ADC and utilizes ESYN and the delay of DSYN calculating channel:
Suppose that bidirectional transmission path postpones equally in transmission course, promptly
Δ 2t=t is up+and t is descending, gets Δ t=(t up+t is descending)/2
When the host computer side encoder starts, utilize ESYN to start timer, utilize decoder DSYN end of output channel timer, the count value of timer is channel latency 2 Δ t.
Characteristics of the present invention are: proposed to utilize based on the synchronized sampling control of coding and decoding and the method for data transmission technology realization optical-fiber longitudinal difference protection.Synchronized sampling precision height, host computer side can monitor from the phase place of pusher side electric current that the debugging of being convenient to put into operation is made troubles.Accident analysis is convenient, and protection sensitivity is improved.The present invention also has following advantage:
1. transmission data three-phase current real-time sampling data and slave side bus voltage and bus negative sequence voltage after the each sampling of slave is finished.
2. show the main frame voltage-phase at host computer side, host and slave processors current phase, host and slave processors three-phase current amplitude, difference stream amplitude.Convenient debugging and in service monitors that difference flows and analyze the generation reason of difference stream.
3. fault initiating record ripple except that admission host computer side information, is also enrolled from pusher side three-phase current waveform.Make things convenient for analysis of failure process and fault to produce reason.
4. main frame monitors when only once error code produces in two cycles, adopts the mean value algorithm, and wrong code data is carried out error correction.
5. real time monitoring synchronous regime, and according to the synchronous regime quick identification fault optical-fibre channel of principal and subordinate's machine.
Description of drawings
Fig. 1 is a main frame Interrupt Process flow chart of the present invention
Fig. 2 is that main frame of the present invention sends message format
Fig. 3 is a slave flow chart of the present invention
Fig. 4 is that slave of the present invention sends the message format example
Fig. 5 is the present invention's schematic diagram of sampling
Embodiment
Interrupt 1.FPGA produce, response of host interrupts, main frame flow chart such as Fig. 1:
Main frame sends 28 bytes, and main frame sends message format such as Fig. 2:
Fig. 2 explanation: synchronous regime: this machine synchronous regime; Jumping order 1 far away, jumping order 2 far away: main frame transmission trip signal is to slave, the far away jumping orders 1 to be former trip signal, trip signal 2 is former trip signal negate transmission, and slave only just exports tripping operation when far jumping order 1 and far jumping order 2 is correct simultaneously, reliably avoid causing the slave malfunction because of error code; Fault type, measurement type, operating value: main frame sends slave longitudinal difference protection fault message, reports guard signal simultaneously from pusher side.
Interrupt 2.FPGA produce, the slave response is interrupted, and slave flow chart 3 is as follows:
Slave sends 28 bytes, and slave sends message format such as Fig. 4: Fig. 4 explanation: synchronous regime: this machine synchronous regime; Uab, Ubc, U2: slave side bus voltage magnitude and bus negative sequence voltage amplitude are used to realize longitudinal difference protection both sides voltage blocking; Ia, Ib, Ic: from pusher side three-phase current sampling number certificate.
3. the three-phase current of the sampled data of the three-phase current of main frame reception slave transmission and this machine relatively calculates three and differs stream.Longitudinal difference protection adopts the split-phase type percentage differential, and according to the characteristics of line fault, adopts both sides voltage blocking differential protection.
4. the slave three-phase current sampled data that receives of main frame and calculate its amplitude, phase place, and show in real time.In debugging and in service, only need to observe the phase relation of host and slave processors electric current at host computer side, just can conveniently find the reason that both sides produce difference stream.
5. what main frame received does same processing from machine data and this machine sampled data.During line fault, host-initiated record ripple except that this machine of admission relevant information, is also enrolled from the pusher side electric current, and can be shown under same coordinate.During convenient and swift analysis of failure accurately, the variation of both sides electric current.
6. for host and slave processors, monitoring channel error code in real time.What transmit based on slave is the real-time sampling data, when main frame monitors when only once error code produces in two cycles, adopts the mean value algorithm, and wrong code data is carried out error correction.Arthmetic statement such as Fig. 5:
Wherein: y2, y3, y4 are three continuous sampled points in the cycle; Y1 is Zhou Boqian corresponding sampling points of y4.Error code point is y4.
The algorithm first step is determined the position of error code point y4 by differential:
If K1=(y4-y3)/(t4-t3), K2=(y3-y2)/(t3-t2).Because t4-t3=t3-t2, and only need the positive and negative of knowledge of result, so K1*K2=(y4-y3) * (y3-y2).And this moment, y4 was uncertain because of error code, replaced y4 so get the y1 of a Zhou Boqian, i.e. K1*K2=(y1-y3) * (y3-y2).
Second step of algorithm is determined error correction algorithm according to the position of error code point y4:
If K1*K2〉0, then y4 crest to trough or trough to half cycle of crest.At this moment, y4=2*y3-y2;
If K1*K2＜=0, the then point of y4 behind crest or trough, y4=y3 at this moment.
For live, slave, read the synchronizing signal of FPGA, judge synchronous regime, and show in real time.Produce because the synchronizing signal of FPGA is judged by this machine decoding lock-out pulse, during the optical-fibre channel fault, judge any bar channel failure fast according to the synchronous regime of principal and subordinate's machine.For the initial stage judges that channel failure provides foundation fast and easily.Be specially: if this machine synchronous regime is 1 (success synchronously), opposite side device synchronous regime is 0 (synchronization failure), then can be judged as the optical-fibre channel fault of this machine transmitting terminal correspondence; If this machine synchronous regime is 0 (synchronization failure), opposite side device synchronous regime is 1 (success synchronously), then can be judged as the optical-fibre channel fault of this machine receiving terminal correspondence.
Embodiment: after finishing synchronously, slave is reportedly delivered to main frame with this sampling number of this machine, phase place, the amplitude of the three-phase current that the current/voltage of main frame computation host and slave transmit, and show that in real time calculate difference stream, the split-phase type percentage differential is adopted in protection.During fault, start the three-phase current data of record ripple admission host information and slave.Main frame monitors when only once error code produces in two cycles, adopts the mean value algorithm, and wrong code data is carried out error correction.
Claims (3)
1. the method for transmission data with transmission line optical-fiber longitudinal difference protection sampling and processing comprises to host computer side with from the optical-fiber longitudinal difference signal of pusher side and handling; It is characterized in that slave sends message format, the data of transmission are without the real-time sampling point data of computing and slave side bus voltage and bus negative sequence voltage; Main frame send from pusher side longitudinal difference protection fault message,, report guard signal simultaneously from pusher side; Uab, Ubc, U2: slave side bus voltage magnitude and bus negative sequence voltage amplitude are used to realize longitudinal difference protection both sides voltage blocking; Ia, Ib, Ic: from pusher side three-phase current sampling number certificate; Main frame receive that slave sends from pusher side three-phase current sampling number certificate, and and the three-phase current of host computer side relatively, differ stream thereby calculate three; Longitudinal difference protection adopts the split-phase type percentage differential, and according to the characteristics of line fault, adopts both sides voltage blocking differential protection; Main frame sends message format, and same trip command is divided into former trip command and negate trip command, and sends in same frame; Phase place, amplitude that the electric current of main frame computation host side, voltage and slave transmit from pusher side three-phase current sampling number certificate, and show in real time; When main frame only monitors in two cycles that once error code produces, adopt the mean value algorithm, wrong code data is carried out error correction.
2. transmission data with transmission line optical-fiber longitudinal difference protection sampling according to claim 1 and the method for handling is characterized in that the main frame admission is from the three-phase current of pusher side when line fault.
3. transmission data with transmission line optical-fiber longitudinal difference protection sampling according to claim 1 and 2 and the method for handling is characterized in that the synchronous regime according to main frame, slave, quick identification fault optical-fibre channel.
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| CN102158306B (en) * | 2010-12-23 | 2013-09-18 | 国网电力科学研究院 | Method for carrying out seamless handover between longitudinal differential protection and pilot protection under single channel |
| CN102723701A (en) * | 2012-06-20 | 2012-10-10 | 湖州电力局 | Remote optical signal locking protection device |
| CN107782989B (en) * | 2016-08-26 | 2020-03-06 | 上海宝冶集团有限公司 | Rapid joint debugging test method for three-terminal optical difference protection channel of line |
| CN112332388A (en) * | 2020-11-27 | 2021-02-05 | 中国南方电网有限责任公司 | Bus differential protection method based on optical fiber communication |
| CN113013852B (en) * | 2021-02-26 | 2022-10-04 | 许继集团有限公司 | Line protection optical fiber channel transmission data processing method and device |
| CN114554585B (en) * | 2022-02-28 | 2024-02-13 | 南京国电南自电网自动化有限公司 | Data synchronization method for differential protection of 5G communication line |
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